import Vue from 'vue'
import Router from 'vue-router'
import http from '@/utils/request'
import {isURL} from '@/utils/validate'

Vue.use(Router)

// 页面路由(独立页面)
export const pageRoutes = [
    {
        path: '/404',
        component: () => import('@/views/pages/404'),
        name: '404',
        meta: {title: '404未找到'},
        beforeEnter(to, from, next) {
            // 拦截处理特殊业务场景
            // 如果, 重定向路由包含__双下划线, 为临时添加路由
            if (/__.*/.test(to.redirectedFrom)) {
                return next(to.redirectedFrom.replace(/__.*/, ''))
            }
            next()
        }
    },
    {path: '/login', component: () => import('@/views/pages/login'), name: 'login', meta: {title: '登录'}}
]

// 模块路由(基于主入口布局页面)
export const moduleRoutes = {
    path: '/',
    component: () => import('@/views/main'),
    name: 'main',
    redirect: {name: 'home'},
    meta: {title: '主入口布局'},
    children: [
        {path: '/home', component: () => import('@/views/modules/home'), name: 'home', meta: {title: '首页', isTab: true}}
    ]
}

export function addDynamicRoute(routeParams, router) {
    // 组装路由名称, 并判断是否已添加, 如是: 则直接跳转
    var routeName = routeParams.routeName
    var dynamicRoute = window.SITE_CONFIG['dynamicRoutes'].filter(item => item.name === routeName)[0]
    if (dynamicRoute) {
        return router.push({name: routeName, params: routeParams.params})
    }
    // 否则: 添加并全局变量保存, 再跳转
    dynamicRoute = {
        path: routeName,
        component: () => import(`@/views/modules/${routeParams.path}`),
        name: routeName,
        meta: {
            ...window.SITE_CONFIG['contentTabDefault'],
            menuId: routeParams.menuId,
            title: `${routeParams.title}`
        }
    }
    router.addRoutes([
        {
            ...moduleRoutes,
            name: `main-dynamic__${dynamicRoute.name}`,
            children: [dynamicRoute]
        }
    ])
    window.SITE_CONFIG['dynamicRoutes'].push(dynamicRoute)
    router.push({name: dynamicRoute.name, params: routeParams.params})
}

const router = new Router({
    mode: 'hash',
    scrollBehavior: () => ({y: 0}),
    routes: pageRoutes.concat(moduleRoutes)
})

router.beforeEach((to, from, next) => {
    // 添加动态(菜单)路由
    // 已添加或者当前路由为页面路由, 可直接访问
    if (window.SITE_CONFIG['dynamicMenuRoutesHasAdded'] || fnCurrentRouteIsPageRoute(to, pageRoutes)) {
        return next()
    }
    // 获取字典列表, 添加并全局变量保存
    http.get('/sys/dict/type/all').then(({data: res}) => {
        if (res.code !== 0) {
            return
        }
        window.SITE_CONFIG['dictList'] = res.data
    }).catch(() => {
    })
    // 获取菜单列表, 添加并全局变量保存
    http.get('/sys/menu/nav').then(({data: res}) => {
        if (res.code !== 0) {
            Vue.prototype.$message.error(res.msg)
            return next({name: 'login'})
        }
        window.SITE_CONFIG['menuList'] = res.data
        fnAddDynamicMenuRoutes(window.SITE_CONFIG['menuList'])
        next({...to, replace: true})
    }).catch(() => {
        next({name: 'login'})
    })
})

/**
 * 判断当前路由是否为页面路由
 * @param {*} route 当前路由
 * @param {*} pageRoutes 页面路由
 */
function fnCurrentRouteIsPageRoute(route, pageRoutes = []) {
    var temp = []
    for (var i = 0; i < pageRoutes.length; i++) {
        if (route.path === pageRoutes[i].path) {
            return true
        }
        if (pageRoutes[i].children && pageRoutes[i].children.length >= 1) {
            temp = temp.concat(pageRoutes[i].children)
        }
    }
    return temp.length >= 1 ? fnCurrentRouteIsPageRoute(route, temp) : false
}

/**
 * 添加动态(菜单)路由
 * @param {*} menuList 菜单列表
 * @param {*} routes 递归创建的动态(菜单)路由
 */
function fnAddDynamicMenuRoutes(menuList = [], routes = []) {
    var temp = []
    for (var i = 0; i < menuList.length; i++) {
        if (menuList[i].children && menuList[i].children.length >= 1) {
            temp = temp.concat(menuList[i].children)
            continue
        }
        // 组装路由
        var route = {
            path: '',
            component: null,
            name: '',
            meta: {
                ...window.SITE_CONFIG['contentTabDefault'],
                menuId: menuList[i].id,
                title: menuList[i].name
            }
        }
        // eslint-disable-next-line
        let URL = (menuList[i].url || '').replace(/{{([^}}]+)?}}/g, (s1, s2) => eval(s2)) // URL支持{{ window.xxx }}占位符变量
        if (isURL(URL)) {
            route['path'] = route['name'] = `i-${menuList[i].id}`
            route['meta']['iframeURL'] = URL
        } else {
            URL = URL.replace(/^\//, '').replace(/_/g, '-')
            route['path'] = route['name'] = URL.replace(/\//g, '-')
            route['component'] = () => import(`@/views/modules/${URL}`)
        }
        routes.push(route)
    }
    if (temp.length >= 1) {
        return fnAddDynamicMenuRoutes(temp, routes)
    }
    // 添加路由
    router.addRoutes([
        {
            ...moduleRoutes,
            name: 'main-dynamic-menu',
            children: routes
        },
        {path: '*', redirect: {name: '404'}}
    ])
    window.SITE_CONFIG['dynamicMenuRoutes'] = routes
    window.SITE_CONFIG['dynamicMenuRoutesHasAdded'] = true
}

export default router
